well isn't there actually in the files "medcine of mp" and it adds 10% to your max mp?.
i dont think there's another one that incrases regeneration, i dont see any point on adding such item, more useless that a bullhamster.
The descritpion is confusing, but what if they meant that it adds 10% max mp, if it was regeneration, they could have said regeneration rate or something along the lines, or mp rate by 1.5 rather than using a percentage.